Battery Life - Mitsubishi Electric MELCEC Q Series User Manual

7. MEMORY CARD AND BATTERY
7.7.1

Battery life

(1)
(2)
Battery life of CPU module
The CPU module battery life differs depending on the CPU model.
The battery life for each CPU is shown below:
CPU model name
Q02CPU-A
Q02HCPU-A, Q06HCPU-A
The actual value indicates an average value; it may be different depending on the ambient
*
temperature.
POINT
(1) Use batteries within the time shown by the guaranteed value.
(2) If the battery may be used exceeding the time shown by the guaranteed
battery life value, perform the ROM operation to protect the program in case
that the battery dies at programmable controller power off, or back up the
program and data within the specified time indicated in the above table after
M9006 (battery low) turns on.
Battery life of SRAM card
The battery life for the SRAM card is shown below:
Battery model name
At storage
Q2MEM-BAT
At operation
* The actual value indicates an average value; it may be different depending on the ambient
temperature.
The battery life at storage indicates the battery consumption time of the SRAM card when
it is installed into a programmable controller CPU with the power off, or when the SRAM
card is stored separately from a programmable controller CPU.
The battery life at operation is the battery consumption time of the SRAM card when it is
installed into a programmable controller CPU with the power on.
POINT
Note that the SRAM card consumes the battery even when it is installed in a CPU
module with the power on.
As a guide, the battery life of the SRAM card is guaranteed for approximately 1.1
years on the condition that it is installed in a CPU module and the module is powered
on one hour a day.
Guaranteed
value (MIN)
50625
2140
Guaranteed
value (MIN)
690
11784
7 - 9
Battery life [hr]
Actual value After M9006
(TYP) turns on
79024 120
16200 120
Battery life [hr]
Actual value After M9006
(TYP) turns on
6336
13872
8
8